Federal prosecutors
charged the surviving suspect in the Boston Marathon bombings with
terrorism on Monday, outlining a chilling plot in which the man and his
brother allegedly used low-grade but deadly explosives timed to detonate
a block apart.

As he lay seriously injured in a Boston area hospital,
Dzhokhar Tsarnaev, 19, was charged with using a weapon of mass
destruction and malicious destruction of property, counts that could
bring him the death penalty. He made his first court appearance in an
unusual, non-public proceeding in which a federal judge and several
lawyers went to his hospital bed.

The toll from the bombings, according to court documents and
interviews on Monday, could have been far higher. Tsarnaev and his
brother, Tamerlan, 26, who was killed Friday after a firefight with
police, had a homemade arsenal of explosives. Some law enforcement
officials said they think the brothers were planning more attacks.

The
pair also apparently had no escape plan. The FBI found in Dzhokhar
Tsarnaev’s college dorm room what appeared to be the same black jacket
and white hat he wore on the day of the attack, court documents said.